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Mousetrap- Powered Car 



Make] Projects 

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build, hack, tweak, share, discover,- 



Mousetrap-Powered Car 

Written By: Dustyn Roberts 



/ TOOLS: 

Multi-tool (1) 



O PARTS: 

Mousetrap (1) 

Dowel (1) 

Eye screws (2) 
the dowel fits into it 

Monofilament line (24") 
fishing line 

Laser-cut wheels (2) 

use template here, make yourself, or 
order from Ponoko.com. I made these 
myself on Eyebeam's laser cutter - one 
of the perks of being a resident! 

Paint-stirring stick (1) 
Ping pong ball (1) 
Duct tape (1) 



• 



SUMMARY 

I built about 60 of these simple kits to show people how to make and race mousetrap- 
powered cars at two events run by artist Aki Sasamoto, co-director of Culture Push. The 
first was a DOING workshop where I taught a small group of 10 professionals from other 
fields. The second was a larger-scale public event called Storm Your Brain , held with 100 
people in attendance at the Whitney Museum as part of the Biennial. This is a fun project 
with just a few simple parts that just about anyone can make. 



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Mousetrap- Powered Car 



Step 1 — Mousetrap-Powered Car 




• Mousetrap 

• 1/4" diameter wooden dowel 

• 2 eye screws that the dowel fits 
into (like McMaster-Carr 
#9496T27) 

• 24" of monofilament (fishing line) 

• 2 laser-cut wheels (use template 
here , make yourself, or order from 
Ponoko.com. I made these myself 
on Eyebeam 's laser cutter - one of 
the perks of being a resident!) 

• Wooden paint stirring stick 

• Ping-pong ball 

• Multi-tool with knife and file, duct 
tape 



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Mousetrap- Powered Car 




• Twist the eye screws into the side of the mousetrap opposite the "bait" hook. They should 
be as close to the edges as you can get them without splitting the wood. 

• Duct-tape the mousetrap down to one end of the paint stirring stick. If the mousetrap arm 
is held down with a little staple-type thing, remove it. 



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Mousetrap- Powered Car 



Step 3 




• Cut a 4" length of the wooden dowel by scoring it with your knife and snapping it with your 
fingers. File off any rough ends or edges. 

• Check to make sure the wooden dowel fits through the eye screws and can spin freely. 
Too loose is okay, too tight is not. If it's too tight, use your file or some sandpaper to 
remove some material. 

• Insert the wooden dowel into one of the laser-cut wheels. It should be snug. If it's too 
loose, wrap the dowel in a little duct tape and try inserting it again. If it's too big, use the 
file to sand down the end until it fits. 

• Then feed the dowel through the two eye screws and attach the other wheel. 



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Mousetrap- Powered Car 



Step 4 




• Duct-tape the ping-pong ball to the 
other end of the paint stick. If you 
set your car down now it should 
balance. The ping pong ball will 
skip along on just about any 
surface since it's so lightweight and 
smooth. 



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Mousetrap- Powered Car 



Step 5 




• In order to stop the wooden dowel from sliding back and forth, wrap strips of duct tape 
around the dowel just inside the eye screws. The dowel should still spin freely. These also 
help the fishing line to stay centered and not get tangled in the eye screws. 

• Cut a 2-ft. length of fishing line. Tie one end around the center of the wooden dowel. Tie 
the other end to the center of the the mousetrap arm. Secure with duct tape if necessary. 

• Now spin the axle to wind the fishing line around it. When you get to the last few spins, 
help pull the mousetrap arm up and set the trap. To set the mousetrap, bring the long hook 
over the U-shaped arm and catch it on the "bait" hook. This takes a delicate touch 
sometimes - watch your fingers!! 

• Once you've set your mousetrap, you're ready to race! Set it down on the floor and use a 
pencil or other long object to trip the mousetrap. The fishing line attached to the arm will 
pull on the line wrapped around the axle and it will start to unwind. Your car should be able 
to go about 10 ft. with this design. Now try some variations and see if you can get the car 
to go faster or farther! 

This project is an excerpt from my upcoming book, Making Things Move . 

This document was last generated on 201 3-01 -28 01:11 :50 PM. 



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